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A significant electrical overvoltage that triggered a extensive blackout across Spanish territory and Portugal has been recognized as the "most severe" electrical incident in Europe during the past two decades, and represents a pioneering event of its category, according to a newly released study.

Damian Cortinas of the association of power network managers declared that this notable incident marked the first known blackout to be specifically initiated by excessive voltage, which occurs when too much electrical voltage builds up within a grid.

"This is new territory," the official stated, explaining that the association's purpose was "not to determine fault to any entity" regarding the root origin.

The spring's outage caused major interruption for almost one full day when it plunged multiple areas into blackout conditions, cutting network services and halting transportation systems.

Widespread Impact

The power outage impacted large parts of the Spanish territory and Portugal, and momentarily influenced southern French territories.

The investigation, published on the weekend, concentrated on the state of the electrical networks on the day of the failure and the progression of incidents preceding it.

Infrastructure Malfunctions

A cascade of "cascading overvoltages" - characterized as an elevation in the electrical supply voltage exceeding the standard level - was found to be the primary cause behind the outage, the analysis found.

Overvoltage can be generated by increases in networks due to surplus generation or lightning strikes, or when safety systems are deficient.

Based on the report, computerized safety protocols were initiated but could not prevent the energy grid from shutting down.

Multiple Examinations

The study follows various distinct examinations and reports by the Madrid authorities, as well as energy corporations. The regulatory body and government officials are also conducting distinct examinations.

The national authorities maintains that the association's findings validates its previous conclusions.

The minister for environmental policy stated that it was "completely in line" with the outcomes of an investigation it commissioned which concluded in June that both the national grid provider and independent power providers were responsible.

Contrasting Narratives

Each of the primary grid operator and the commercial companies have maintained that they were not responsible. The controlling entity has assigned responsibility for the outage on specific conventional energy facilities' shortcoming to help maintain proper electrical levels.

Local power providers stated it was caused by deficient strategy from network managers.

Examination Challenges

The study also noted that certain crucial information was absent and that "acquiring comprehensive, accurate information proved particularly problematic for this investigation".

A definitive analysis, to be released in the beginning period of the following year, will examine the underlying reasons of the overvoltage and the actions employed to manage electrical levels in the system.

Governmental Discussion

The blackout triggered a broader debate that extended into the governmental sphere about the nation's electrical approach.

The political rivals suggested that an growing dependence on renewable energy, advocated by the ruling coalition of the prime minister, could have been a relevant element in causing the failure and the territory's diminishing production of nuclear energy meant a consistent reserve was not available.

The government roundly rejected these theories and the fresh investigation was cautious to remain neutral when it concerned the reasons of the month's exceptional failure.

Immediate Impacts

The power disruption compelled Madrid Open Tennis managers to stop a match partially completed the contest.

The country's nuclear stations automatically stopped when the failure struck, and the national petroleum corporation reported it halted operations at its oil refineries.

Civil Chaos

Buildings were thrown into powerless state, while mobile phones and traffic lights ceased functioning. Queues snaked around city blocks and card payments stopped working, compelling people to wait for currency and pack onto buses as other transport systems were non-functional.

First responders were summoned to multiple edifices to extricate people stuck in lifts in the Madrid region and medical facilities initiated contingency procedures, stopping normal activities.